MELF RESISTORS * Resistors shall have a power rating based on continuous full load operation at an ambient temperature of 70 c *For temperature in excess of 70 , the load shall be derated *Resistors shall have a rated direct-current (DC) continuous working voltage *an approximate sine-wave root-mean-square (RMS) alternatingcurrent (AC) continuous working voltage at commercial-line frequency and waveform curresponding to the power rating Website: www.royalohm.com Email: info@royalohm.com (Thailand ) info-sz@royalohm.com.cn (China Shenzhen ) Part Number System Explanation of Part Number System (MELF Carbon Film Resistors) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 M C 2 7 S 2 J 0 1 0 1 T 2 0 Product Type: Resistance Value: MC24 = MELF Carbon Film type 0204 E-24 series: the 1 digit is"0", st nd MC27 = MELF Carbon Film type 0207 rd the 2 & 3 digits are for the significant figures of the th resistance and the 4 indicate the number of zeros following: Wattage: Normal size: Small size: W8 = 1/8W S4 = 1/4W-S W4 = 1/4W S2 = 1/2W-S "J" ~ 0.1, "K" ~ 0.01 Ex.: 4.7 ~ 47J, 4.7K ~ 472 Packing Type: T = Tape/Reel Tolerance: G = 2% J = 5% Packing Quantity: 2 = 2,000pcs 3 = 3,000pcs B = 2,500pcs Sample: MELF Carbon Film type 0204 1/4W-S +/- 5% 100 Tape/Reel 3,000 MC24S4J0101T30 MELF Carbon Film type 0207 1/4W +/- 5% 100 Tape/Reel 2,000 MC27W4J0101T20 Addition Information: 0 = NIL MELF Carbon Film type 0207 1/2W-S +/- 5% 100 Tape/Reel 2,000 MC27S2J0101T20 Ratings: Type Power Rating Max. Working Voltage Max. Overload Voltage Temperature Range Ambient Temperature MECF 0204 MECF 0207 MECF 0207 0.25W (1/4W-S) 0.25W (1/4W) 0.50W (1/2W-S) 250 V 500 V 300 V 600 V 300 V 600 V -55 +155 70 1 Power rating: Resistors shall have a power rating based on continuous full load operation at an ambient temperature of 70 . For temperature in excess of 70 , the load shall be derated as shown in the figure 1. 2 Voltage rating: Resistors shall have a rated direct-current (DC) continuous working voltage or an approximatesine-wave root-mean-square (RMS) alternating-current (AC) continuous working voltage at commercial-line frequency and waveform curresponding to the power rating , as determined from the following formula : P x R Were : RCWV = Rated DC or RMS AC continuous working voltage at commercial-line frequency and waveform (volt) RCWV = P = Power Rating (watt) R = Nominal Resistance (ohm) In no case shall the rated DC or RMS AC continuous working voltage be greater than the applicable maximum value. Figure 1. Construction : No. 1 2 3 4 5 Name Basic Body Resistance Film End Cap Coating Color Code Material Rod Type Ceramics Carbon Film Steel (Tin plated iron surface) Insulated resin ( Color : Ivory ) Epoxy Resin Power rating and dimensions Dimension : Dimension (mm) Type Power Rating 0.25W 0.25W 0.5W MECF 0204 MECF 0207 MECF 0207 L C Min D1 D2 Max D3 Max 3.50.2 5.90.2 5.90.2 0.5 0.5 0.5 1.400.15 2.20.1 2.20.1 1.55 2.4 2.4 1.25 2.1 2.1 Power Rating : Type MECF 0204 MECF 0207 MECF 0207 Power Rating at 70 0.25W(1/4W-S) 0.25W(1/4W) 0.50W(1/2W-S) Tolerance % 5 5 5 Resistance Range 1 ~ 1M 1 ~ 1M 1 ~ 1M Part Number System Explanation of Part Number System (MELF Metal Film Resistors) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 M 2 7 W 4 F F 1 0 0 0 T 2 0 Product Type: Resistance Value: M24 = MELF Metal Film E-24 series: the 1 digit is"0", st nd type 0204 rd the 2 & 3 digits are for the significant figures of the M27 = MELF Metal Filmx th type 0204 resistance and the 4 indicate the number of zeros following: "J" ~ 0.1, "K" ~ 0.01 Ex.: 4.7 ~ 47J, 4.7K ~ 472 Wattage: st Normal size: Small size: E--96 Series: the 1 to 3 rd digits W8 = 1/8W S4 = 1/4W-S are significant figures of W4 = 1/4W S2 = 1/2W-S resistance and the fourth one denotes number of zeros following: Tolerance: B = 0.1% D = 0.5% G = 2% C = 0.25% F = 1% J = 5% Ex.: 1.33K = 1331 PPM requirement: A = 10PPM F = 50PPM B = 15PPM G = 100PPM C = 25PPM J = 200PPM Packing Type: T = Tape/Reel Packing Quantity: 2 = 2,000pcs 3 = 3,000pcs B = 2,500pcs Sample: MELF Metal Film type 0204 1/4W-S +/- 1% 50PPM 100 Tape/Reel 3,000 M24S4FF1000T30 MELF Metal Film type 0207 1/4W +/- 1% 50PPM 100 Tape/Reel 2,000 M27W4FF1000T20 Addition Information: 0 = NIL MELF Metal Film type 0207 1/2W-S +/- 1% 50PPM 100 Tape/Reel 2,000 M27S2FF1000T20 Ratings: Type MEMF 0204 MEMF 0207 MEMF 0207 0.25W (1/4W-S) 0.25W (1/4W) 0.50W (1/2W-S) Max. Working Voltage 200 V 250 V 250 V Max. Overload Voltage 400 V 500 V 500 V Power Rating Temperature Range Ambient Temperature -55 +155 70 1 Power rating: Resistors shall have a power rating based on continuous full load operation at an ambient temperature of 70 . For temperature in excess of 70 , the load shall be derated as shown in the figure 1. 2 Voltage rating: Resistors shall have a rated direct-current (DC) continuous working voltage or an approximate sine-wave root-mean-square (RMS) alternating-current (AC) continuous working voltage at commercialline frequency and waveform curresponding to the power rating , as determined from the following formula : RCWV = P x R Were : RCWV = Rated DC or RMS AC continuous working voltage at commercial-line frequency and waveform (volt) P = Power Rating (watt) R = Nominal Resistance (ohm) In no case shall the rated DC or RMS AC continuous working voltage be greater than the applicable maximum value. Figure 1. Construction : No. 1 2 3 4 5 Name Basic Body Resistance Film End Cap Coating Color Code Material Rod Type Ceramics Metal Film Steel (Tin plated iron surface) Insulated epoxy resin ( Color : Blue ) Epoxy Resin Power rating and dimensions Dimension : Dimension (mm) Type MEMF 0204 MEMF 0207 MEMF 0207 Power Rating 0.25W 0.25W 0.5W L C Min D1 D2 Max D3 Max 3.50.2 5.90.2 5.90.2 0.5 0.5 0.5 1.400.15 2.20.1 2.20.1 1.55 2.4 2.4 1.25 2.1 2.1 Power Rating : Type Power Rating at 70 MEMF 0204 0.25W(1/4W-S) MEMF 0207 0.25W(1/4W) MEMF 0207 0.50W(1/2W-S) Tolerance % 5 5 5 Resistance Range 10 ~ 1M 10 ~ 1M 10 ~ 1M